Abstract
THE optimum post-inoculation temperature for the development of macroscopic lesions of the common strain of tobacco mosaic virus (TMV) on Phaseolus vulgaris L. var. ’Pinto‘ is about 31° C, whereas for the sweet potato strain it is 16° C or lower1. This report describes the effects of post-inoculation temperatures of 20°, 25° and 30° C, and light intensities of 640 ft.-candles and 4,000 ft.-candles on the development of macroscopic lesions and the total number of detectable lesions (starch lesions)2 by three further strains of TMV : ’U1‘, which is an example of the common strain of TMV and is well known to form lesions on Pinto bean leaves, ’U2‘ (ref. 3), which is reported to form lesions on this host by some authors2,4,5, but not by others6–9, and ’VM‘ (ref. 10), which previously was not known to form lesions on this host8,9.
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